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Fair Value Measurements (Outstanding Borrowings) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 25, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value $ 565,125 $ 558,125
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instruments at fair value 599,685 588,466
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Term Loan
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instruments at fair value 372,285 369,966
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Senior Notes
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instruments at fair value 220,400 218,500
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Revolving Credit Facility
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instruments at fair value $ 7,000 $ 0